| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an anti-glare diffusion film configured to prevent interference fringes by sufficient diffusion effects, hardly cause wet-out or cut-off, and maintain display definition without necessitating man-hour and cost of diffusion sheet or diffusion mat processing. <P>SOLUTION: Provided that a value obtained by dividing a mountain-to-valley mean height value (hm) that is a mean height value between the mountain and the valley in a measurement reference area of a convex structure by a mountain-to-valley horizontal mean value (Sm) that is a horizontal distance mean value between the mountain and the valley is a gradient ratio (hm/Sm), and an arctangent value tan<SP POS="POST">-1</SP>(hm/Sm) of the gradient ratio(hm/Sm) is a mean gradient angle (θm), the mean gradient angle (θm) is in the range of 5° or more and 15° or less, and the standard deviation of the mean gradient angle (θm) is in the range of 30% or more and 40% or less of the mean gradient angle (θm), and the regular reflectance at the regular reflection angle with respect to the incident light made incident at an angle of 30° from the normal direction of the film surface is 1% or less. <P>COPYRIGHT: (C)2012,JPO&INPIT |
